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How can polyps or cancer cause blood in the stool?

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Polyps are benign growths that can grow, bleed, and become cancerous. Colorectal cancer is the fourth most common cancer in the U.S. It often causes bleeding that is not noticeable with the naked eye.

From: Blood in Stool WebMD Medical Reference

SOURCES:

MedlinePlus: "Bloody or tarry stools."

Nebraska Colon Cancer Screening Program: "Rectal Bleeding: What You Should Know."

MedlinePlus: "Gastrointestinal fistula."

NYU Langone Medical Center: "Angiodysplasia of the Colon."

National Digestive Diseases Information Clearinghouse: "Bleeding in the Digestive Tract."

The Ohio State University Medical Center: "Peptic Ulcers."

Reviewed by William Blahd on July 11, 2017

SOURCES:

MedlinePlus: "Bloody or tarry stools."

Nebraska Colon Cancer Screening Program: "Rectal Bleeding: What You Should Know."

MedlinePlus: "Gastrointestinal fistula."

NYU Langone Medical Center: "Angiodysplasia of the Colon."

National Digestive Diseases Information Clearinghouse: "Bleeding in the Digestive Tract."

The Ohio State University Medical Center: "Peptic Ulcers."

Reviewed by William Blahd on July 11, 2017

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How can esophageal problems cause blood in the stool?

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

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